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SAP 10.2 Table 3 (PDF p.160) row 1: primary circuit loss applies when "hot water is heated by a heat generator (e.g. boiler) connected to a hot water storage vessel via insulated or uninsulated pipes". The Table 4a hot-water-only codes (PDF p.166) 911 gas / 912 liquid / 913 solid boiler-circulator + 921-931 range cooker with boiler are each a heat generator feeding the cylinder through a primary loop. `_primary_loss_applies` keyed only off the resolved DHW `main` — but for these certs `_water_heating_main` returns the SPACE main (e.g. electric storage heaters, SAP code 402, which has no primary loop), so every boiler branch missed the gas water-boiler's primary circuit and (59)m went to zero. New branch keys off `water_heating_code` ∈ `_WATER_HEATING_BOILER_CIRCULATOR_CODES`. 941 (electric HP for water only) is excluded — HP DHW vessels follow the Table 3 integral-vessel rules. Simulated case 19 (electric storage main + WHS 911 + 210 L cylinder): (62)m total HW demand 2493.30 → 3169.98 kWh/yr, matching the worksheet (the missing 676.68 kWh/yr = the worksheet's (59) primary-loss annual sum, h=5/p=0). The remaining (64)/(219) gap is the PV diverter (63b), deferred to its own slice. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| data_transformation | ||
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| fuel_rates | ||
| geospatial | ||
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| property_baseline | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| postcode.py | ||